Then probably you haven't understood one of the biggest user needs - people don't want to "be bored". They constantly want some entertainment as stimulus. Look

Then probably you haven't understood one of the biggest user needs - people don't want to "be bored". They constantly want some entertainment as stimulus. Look at people around you (grocery checkout lines or bus stop or subway or Starbucks) - everyone is glued to their phone screens. And Facebook is the ultimate magnet to waste those 2-5 min wait times one has to endure every so often. Earlier, people would get bored waiting in line, or strike conversations with strangers or just muse over random thoughts. No more. All that attention has gone to their smartphones. And advertisers are simply following those eyeballs. Since Facebook manages to capture so much attention of so many humans, they rake in billions.